UI bug with colors for ner.manual

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:bug: Bug description:
When using a custom theme with colors for each label, UI uses the wrong color after a tag is removed.

:man_walking:t4:Reproduction steps:
How can we recreate the bug?

  • Create sample.jsonl with this content: {"text": "This is a test"}
  • Create prodigy.json with this content {"custom_theme": {"labels": {"A": "#ff0000", "B": "#00ff00}}}
  • Run prodigy ner.manual sample blank:xx sample.jsonl --label A,B
  • Tag "This" with A and "test" with B
  • Remove A tag
  • Notice that B tag color has changed to A's

:desktop_computer: Environment variables:
Version 1.15.8
Platform Linux-6.8.0-49-generic-x86_64-with-glibc2.39
Python Version 3.12.3
spaCy Version 3.7.5